9

LTC4301

4301fb

filter to prevent the LTC4301 from becoming activated

until the transients associated with live insertion have

the resistor from CS to GND.

Repeater/Bus Extender Application

Users who wish to connect two 2-wire systems separated

by a distance can do so by connecting two LTC4301s

allows for 400pF maximum bus capacitance, severely

limiting the length of the bus. The SMBus specification

places no restriction on bus capacitance, but the limited

impedances of devices connected to the bus require

systems to remain small if rise- and fall-time specifica-

tions are to be met. Using the LTC4301 allows the capaci-

tance to be isolated into smaller sections, enabling the

APPLICATIO S I FOR ATIO

R3

100k

SDAIN

SCLIN

GND

SDAOUT

SCLOUT

READY

CS

SDAIN

SCLIN

GND

SDAOUT

SCLOUT

READY

4301 F05

R9

10k

R8

10k

R10

10k

I/O PERIPHERAL CARD 2

LTC4301

CARD2_SCL

CARD2_SDA

R5

10k

R4

10k

I/O PERIPHERAL CARD 1

LTC4301

CARD_SCL

CARD_SDA

R1

10k

R2

10k

BACKPLANE

BACKPLANE

CONNECTOR

SDA

SCL

0.01

µF

0.1

µF

0.01

µF

R6

10k

•

•

•

R7

100k

CS

0.1

µF

system to meet rise- and fall-time requirements. In this

situation, the differential ground voltage between the two

systems may limit the allowed distance, because valid

logic low voltage with respect to the ground at one end of

respect to the ground at the other end. In addition, the

connection circuitry offset voltages of the back-to-back

LTC4301s add together, directly contributing to the same

problem.

Systems with Supply Voltage Droop

at various points in the system can differ by a few hundred

millivolts or more. This situation is well modelled by a series

Figure 5. Inserting Multiple I/O Cards into a Live Backplane Using the LTC4301 in a PCI System